A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 2925-01-027-1293
NSN 6145-01-473-5599
NSN 5999-01-172-7625
NSN 6135-00-437-5182
NSN 6150-01-227-5961
NSN 5915-01-317-3541
NSN 5920-00-175-1171
NSN 5930-01-425-9575
NSN 5915-01-633-9845
NSN 5910-01-435-7342
NSN 5965-00-368-2879
NSN 5965-00-919-7894